The following video is from Thursday's Investor Beat, in which host Chris Hill and Motley Fool analysts Tim Hanson and Matt Koppenheffer dissect the hardest-hitting investing stories of the day.

Activist investor Dan Loeb holds a 9% stake in Sotheby's (BID), and is now calling for the auction house's CEO, William Ruprecht, to step down, bringing the stock up to a two-year high. In the lead story on today's Investor Beat, Tim and Matt take a look at Loeb's case and activist investor trends on the whole. They also share their thoughts on whether Sotheby's is a buy, sell, or hold at today's prices.